import { performance, PerformanceObserver } from 'perf_hooks';
import os from 'os';

type ResourceMetrics = {
  cpu: number;
  memory: number;
  network: number; 
};

export class PerformanceMonitor {
  private metrics: ResourceMetrics = {
    cpu: 0,
    memory: 0,
    network: 0
  };

  start() {
    // CPU使用率监控
    const cpuStart = os.cpus().map(c => c.times);
    setInterval(() => {
      const cpuEnd = os.cpus().map(c => c.times);
      this.metrics.cpu = this.calculateCpuUsage(cpuStart, cpuEnd);
    }, 1000);

    // 内存监控
    setInterval(() => {
      this.metrics.memory = os.freemem() / os.totalmem();
    }, 1000);

    // 网络监控(简化版)
    performance.mark('network-start');
  }

  private calculateCpuUsage(start: any[], end: any[]): number {
    // CPU计算逻辑
    return 0.5; // 示例值
  }

  shouldDegrade(): boolean {
    return this.metrics.cpu > 0.8 || 
           this.metrics.memory < 0.2;
  }

  getMetrics(): ResourceMetrics {
    return this.metrics;
  }
}